There are old-fashioned blueprint boxes that might do the trick, cardboard (i.e. cheap) boxes divided up checkerboard-style so that a rolled-up set of blueprints can be stored upright in each cell. If the cells are big enough for a tripod (probably, but not completely sure), it would be an easy way to keep a bunch of them easily accessible, but compact because they are all stored vertical & upright.

Depending on the number of tripods you have, you could use the opportunity to purchase yet another bag... Perhaps a Kata one.

However, if you have so many that you can't count them all, consider getting several plastic pipes with a large diameter, cutting them into approximate four foot strips, and stacking them like round tubular cubby holes.

You could build something aking to a rifle rack on the wall to place the tripods on. A couple of two/three inch posts sticking out of the wall should be sufficient to place the tripods on such that they are out of the way and easily accessible.

However, if you have so many that you can't count them all, consider getting several plastic pipes with a large diameter, cutting them into approximate four foot strips, and stacking them like round tubular cubby holes.